Mabel is offered a job selling magazine subscriptions. She has the choice of two pay scales.

Pay Scale 1:

She can be paid $0.65 for each subscription she sells.

Pay Scale 2:

She can be paid $0.10 for the first subscription, with the wage going up $0.05 more for each subscription after the first. For her first sale she would make $0.10, for her second sale she would make $0.15, for her third sale she would make $0.20, and so on.

Analyze and compare the two pay scales. Which pay scale is better? Explain your reasoning. include the general term and some specific calculations in your analysis.

what I have so far is for pay scale 1

tn= 0.65n

t20= 0.65(20)

= 13

now all I really need help with is figuring out what to use for pay scale 2.